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Flame ionization detectors cannot detect inorganic substances and some highly oxygenated or functionalized species like infrared and laser technology can. In some systems, CO and CO 2 can be detected in the FID using a methanizer , which is a bed of Ni catalyst that reduces CO and CO 2 to methane, which can be in turn detected by the FID.
The nitrogen–phosphorus detector (NPD) is also known as thermionic specific detector (TSD) is a detector commonly used with gas chromatography, in which thermal energy is used to ionize an analyte. [ 1 ] [ 2 ] It is a type of flame thermionic detector (FTD), the other being the alkali flame-ionization detector (AFID also known as AFD).
Flame ionization detector (FID) -- uses a flame to produce ions; Electron capture detector (ECD) -- uses beta radiation; Photo-ionization detector (PID) -- uses UV light to produce ions; Helium ionization detector (HID) -- uses a radioactive source to produce helium ions, which in turn ionize the components
Individual components (gases) are separated and detected by either a thermal conductivity detector (TCD), a flame ionization detector (FID), or an electron capture detector (ECD). Using the known temperature of the sample, the bottle volume, the concentrations of gas in the headspace (as determined by GC), and Henry's law constant, the ...
Commonly used detectors are the flame ionization detector (FID) and the thermal conductivity detector (TCD). While TCDs are beneficial in that they are non-destructive, its low detection limit for most analytes inhibits widespread use. [1] FIDs are sensitive primarily to hydrocarbons, and are more sensitive to them than TCD. [4]
Methanizer is an appliance used in gas chromatography (GC), which allows the user to detect very low concentrations of carbon monoxide and carbon dioxide.It consists of a flame ionization detector, preceded by a hydrogenating reactor, which converts CO 2 and CO into methane CH 4.
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